How to Deploy a Fresh App in Deno: Step-by-Step Guide

To deploy a fresh app in Deno, first create your app using the fresh framework, then build it with deno task build. Finally, run the app on a server using deno task start or deploy it to a platform that supports Deno like Deno Deploy or a VPS.

Syntax

Deploying a fresh app in Deno involves these main commands:

• deno task build: Compiles your fresh app for production.
• deno task start: Starts the compiled app server.
• Optional: Use deno run with permissions to run the app directly.

These commands are defined in your package.json or deno.json config file.

json

{
  "tasks": {
    "build": "fresh build",
    "start": "deno run -A --unstable ./main.ts"
  }
}

Example

This example shows how to create, build, and run a fresh app for deployment.

1. Create a fresh app:

deno run -A -r https://fresh.deno.dev my-fresh-app

2. Change directory and build:

cd my-fresh-app
deno task build

3. Start the app server:

deno task start

The app will be available at http://localhost:8000.

typescript

import { start } from "$fresh/server.ts";
import manifest from "./fresh.gen.ts";

await start(manifest, { port: 8000 });

Output

Listening on http://localhost:8000

Common Pitfalls

Common mistakes when deploying a fresh app in Deno include:

• Not granting required permissions like -A (all permissions) when running the app.
• Skipping the build step, which can cause slower startup or missing compiled files.
• Trying to run the app without the --unstable flag if your app uses unstable APIs.
• Not setting environment variables or ports correctly for production.

Always check your deno.json and task scripts for correct commands.

bash

/* Wrong way: missing permissions and build */
deno run main.ts

/* Right way: build then run with permissions */
deno task build
deno run -A --unstable main.ts

Quick Reference

Command	Purpose
deno run -A --unstable main.ts	Run the app with all permissions and unstable APIs
deno task build	Build the fresh app for production
deno task start	Start the built app server
deno run -A -r https://fresh.deno.dev my-fresh-app	Create a new fresh app

Key Takeaways

Always build your fresh app before deploying using 'deno task build'.

Run your app with proper permissions using 'deno run -A --unstable'.

Use 'deno task start' to launch the production server.

Check your 'deno.json' tasks for correct build and start commands.

Deploy on platforms supporting Deno or your own server with Deno installed.